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vfs: replace calling i_op->readlink with vfs_readlink()

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Also check d_is_symlink() in callers instead of inode->i_op->readlink
because following patches will allow NULL ->readlink for symlinks.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi
2016-12-09 16:45:04 +01:00
parent 2a07a1f5ab
commit fd4a0edf2a
6 changed files with 35 additions and 13 deletions
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8
fs/nfsd/nfs4xdr.c
View File

@@ -3576,10 +3576,10 @@ nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd
if (!p)
return nfserr_resource;
/*
* XXX: By default, the ->readlink() VFS op will truncate symlinks
* if they would overflow the buffer. Is this kosher in NFSv4? If
* not, one easy fix is: if ->readlink() precisely fills the buffer,
* assume that truncation occurred, and return NFS4ERR_RESOURCE.
* XXX: By default, vfs_readlink() will truncate symlinks if they
* would overflow the buffer. Is this kosher in NFSv4? If not, one
* easy fix is: if vfs_readlink() precisely fills the buffer, assume
* that truncation occurred, and return NFS4ERR_RESOURCE.
*/
nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
(char *)p, &maxcount);

6
fs/nfsd/vfs.c
View File

@@ -1451,7 +1451,6 @@ do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
__be32
nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
{
struct inode *inode;
mm_segment_t oldfs;
__be32 err;
int host_err;
@@ -1463,10 +1462,9 @@ nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
path.mnt = fhp->fh_export->ex_path.mnt;
path.dentry = fhp->fh_dentry;
inode = d_inode(path.dentry);
err = nfserr_inval;
if (!inode->i_op->readlink)
if (!d_is_symlink(path.dentry))
goto out;
touch_atime(&path);
@@ -1475,7 +1473,7 @@ nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
*/
oldfs = get_fs(); set_fs(KERNEL_DS);
host_err = inode->i_op->readlink(path.dentry, (char __user *)buf, *lenp);
host_err = vfs_readlink(path.dentry, (char __user *)buf, *lenp);
set_fs(oldfs);
if (host_err < 0)